In the 7-bit ASCII character set, ASCII code 4 is represented by the control character ␄ also known as the end of transmission.

Attribute Value
Symbol ␄
Unicode Symbol ␄
Decimal 4
Octal 4
Hexadecimal 4
Binary 0000 0100
Description End of Transmission
Category Control Characters
Subcategory Transmission Control
Unicode U+0004